Fastening device for pump impellers



Sept. 20, 1949. s. H. WEAVER FASTENING DEVICE FOR PUMP IMPELLERS Filed March 2, 1945 INVENTOR J'amueZ/Il-Weav'eo BY HlS ATTORNEY.

Patented Sept. 20, 1949 UNITED STATES PATENT OFFICE ras'rsme DEVICE roa rm Samuel H. Weaver, Philllpsburg, N. 1.,

winner to Ingersoll-Rand Company, New York, N.- Y., a corporation of New Jersey Application March 2, 1945, Serial 80. 580,523

7 Claims. (Cl. 287-52) This invention relates to pumps, and more particularly to a device for securing an impeller to the shaft of a centrifugal pump.

One. object of the invention is to facilitate the In the drawings accompanying this speciiica-' tion and in which similar reference numerals refer to similar parts,

, 2 an annular groove 32 -for the accommodation of a split ring 23. 1

The portion 23 of the bore extends only to the intermediate portion of the impeller and at its irmer end is a shoulder 34 to seat either directly against a side 35 of the ring 33 or, as illustrated,

I against one of a group of liners 38 that may be Figure 1 is a longitudinal elevation, partly in section, of a portion of a centrifugal pump having the invention applied thereto,

Figure 2 is a view similar to Figure l, somewhat enlarged, showing an impeller secured to the shaft in accordance with the practice of the invention,

Figure 3 is a view similar to Figure 2 illustrating the manner in which the impeller may be conveniently removed from the shaft, and

Figure 4 is a perspective view of a detail.

Referring more particularly to the drawings, 20

designates a portion of a centrifugal pump com-' prising a casing 2|, a shaft 22 therein and impellers 23 on the shaft.

The casing 2! is of the horizontally split ty-pe comprising upper and lower sections 24 and 25 that may be secured together in any well known manner. The casing sections are. suitably recessed interiorly to provide chambers 26 for the accommodation of the impellers and to provide the ,usual passages (not shown) for conveying liquid from one chamber to another.

In accordance with the practice of the invention, means are provided for secur ng the impeller 23 in the assembled position upon the shaft and also for conveniently adjusting the impeller axially of the shaft in order to position it correctly within the chamber containing it. To these ends the hub 21 of the impeller is provided with a bore 28 a portion 29 of which has a slide fit on the shaft. The hub 21 and the shaft have the I usual slots 30 for the accommodation of a key 3| serving to hold the impeller and the shaft against relative rotary movement, and in the periphery of the shaft, adjacent an endof the key slot, is

The sleeve is accordingly provided with an exter-.

- impeller on the shaft the impeller is first moved interposed between the shoulder and the ring 33 whenever required to, position the impeller correctly upon the shaft.

The opposite hand portion 31 of the bore 28 is 'of enlarged diameter and is provided with internal threads 38' for the accommodation of threads on the exterior of a sleeve 39 the inner end of which seats against the opposed side surface 40 of the ring 33 for clamping the impeller to the ring. The bore ll of the sleeve 39 is also a slide fit on the shaft, and on the end of the sleeve lying exteriorly of the impeller hub is an annular enlargement 22 that is sloped to conform with the adjacent surfaces 43 of the waterways 44 in the impeller. I

The end of the sleeve adjacent the enlargement 42 is slotted radially to define a series of teeth 45 for engagement with a tool whereby the sleeve 39 is turned into and out of its assembled position.

A tool suitable for this purpose may, as shown, be

in the form of a sleeve 46 adapted to encircle the shaft and has teeth in one end for interlocking engagement with the teeth 45. In the intermediate portion of the sleeve 46 are apertures 48 to receive the end of a lever (not shown) whereby the sleeve may be rotated, and on the opposite end ofthe sleeve are external threads 49 which, upon reversal of the sleeve upon the shaft as illustrated more particularly in Figure 3, may be threaded into engagement with the threads in the impeller hub and thereby serve as a link between the impeller and mechanism commonly employed for pulling an impeller from the shaft.

nal annular groove 50 for engagement with a puller only the hooked portions 5| of which are shown.

The sleeve 46 is readily slidable and rotatable on the shaft 22 and will. of course, be removed from the shaft after the impellers are correctly secured in position.

In practice, whenever it is intended to place anto the vicinity of the annular groove 32, say to the right hand side thereof in Figure 2 of the drawings. The key 3| is then placed in the slot 30 in the shaft and next the impeller may be moved to the left to effect engagement of its slot 30 with the key. Thereafter a liner. or liners, is arranged about the shaft between the groove 32 and the shoulder 34 and the split ring is placed into the groove 32.

With the parts in these positions, the impeller is next moved toward the left to a position permitting inter-engagement of at least a fewof the threads on the hub and the sleeve, and upon continued threading of the sleeve 39 into the hub and after its end surface engages the split ring the impeller is drawn-leftward and securely clamped to the ring. This rotative movement of the sleeve 39 will, of course, be effected by means of the sleeve 46, as will also be the reverse movement required for disconnecting the impeller from the ring 33.

In Figure 2 of the drawings, four liners are shown interposed between the split ring and the shoulder 34. It will, however, be readily understood that the number has been selected merely for illustrative purposes and will vary with the degree of adjustment of the impeller axially of the shaft as necessitated by any misalignments of easing surfaces or deformities that may be caused in the pump casing during the casting thereof.

I claim:

1. A fastening device, comprising a shaft having an an annular member thereon, an impeller having a bore to receive the shaft and the annular member, a shoulder within the bore, and means threadedly connected to the impeller seating against one side'of the annular member for pressing the shoulder against the opposite side of said member upon rotation of the said means for securing the impeller against endwise movement with respect to the shaft.

2. A fastening device, comprising a shaft having an annular member thereon, an impeller shoulder and said one seating surface whereby the impeller maybe adjusted axially of the shaft, and adjustable means seating against the other seating surface for clamping the impeller to the annular member.

having a bore to receive the shaft and the annular member, a shoulder within the bore to cooperate with one side of the annular member for preventing endwise movement of the impeller in one direction on the shaft, and a sleeve threaded into the bore acting against the opposed side of the annular member for preventing endwise movement of the impeller in the opposite direction.

3. A fastening device, comprising a shaft having an external annular groove, a split ring in the groove, an impeller having a bore to receive the shaft and the split ring, a shoulder in the intermediate portion of the bore to cooperate with one side of the split ring for preventing endwise movement of the impeller on the shaft in one direction, a sleeve threaded into the bore to cooperate with the opposed side of the split ring to hold the impeller against movement in an op- 60 posits direction relatively to the shaft, and means for preventing relative rotation between the shaft and the impeller.

6. A fastening device, comprising a shaft, an annular member thereon having opposed seating surfaces, an impeller having a bore to receive the shaft, a shoulder in the bore opposed to a seating surface, one or more removable liners interposed between the shoulder and a seatin surface for adjusting the impeller axially of the shaft, and adjustable means carried by the impeller seating against another seating surface for securing the impeller to the annular member.

7. A fastening device, comprising a shaft, an annular member thereon, an impeller on the shaft, a shoulder on the impeller opposed to a side surface of the annular member, one or more removable liners interposed between the annular member and the shoulder for adjusting the impeller axially of the shaft, and a sleeve threadedly connected to the impeller and acting against the annular member for securing the impeller to the said annular member.

SAMUEL H. WEAVER.

nnsnnENcEs CITED The following references are of record in the file of this patent:

, UNITED STATES PATENTS Number 

